Cutting Valve Guides when Porting Head
This subject has been debated a few times and it's all in who you talk too. MDB grinds his flush with the ports(he also uses HUGE valves and BIG ports) but the guys from NR Racing say that they only remove a certain amount of the stem(I think because they found out that removing any more guide didn't help). So it's up to you bro. :thumbsup: I went with NR but That's only because I am running stock size valves.
Its not in the port itself, its in the combustion chamber side of cylinder head. I attached a picture to help describe what I can't. I tried to highlight the area in red. Its the area where the valve head is recessed (about a 1/8" or more) into the combustion chamber. Is that area worth working or is it better left untouched? Or for that matter, is the combustion side of the head worth working?
If you have a bearing scarper you can knock off the corners around the vlave seats by hand.
This is a slow a careful process though ( done with valves in place and good lighting.
Follow up with some sanding )....
You could spend all day doing this though and never aproach what the proper machines tools can do in short order.
Just sort of a time to kill project that will make a modest gain.
If you look closely at the head ( 14cc ) you may also notice there is some material shrouding around outside that you can clean around too. Just make sure you mark the limits of where metal can be removed with a head gasket.
Here's a head with a little touch up in these areas.
clone stuff :: 100_9712.jpg picture by Dougwp - Photobucket
There was room to do a lot more work but this was done by hand with a bearing scraper and dremel tool in justa few minuts.
Just remember to keep the valves in the head and polish up after your done.
This is a slow a careful process though ( done with valves in place and good lighting.
Follow up with some sanding )....
You could spend all day doing this though and never aproach what the proper machines tools can do in short order.
Just sort of a time to kill project that will make a modest gain.
If you look closely at the head ( 14cc ) you may also notice there is some material shrouding around outside that you can clean around too. Just make sure you mark the limits of where metal can be removed with a head gasket.
Here's a head with a little touch up in these areas.
clone stuff :: 100_9712.jpg picture by Dougwp - Photobucket
There was room to do a lot more work but this was done by hand with a bearing scraper and dremel tool in justa few minuts.
Just remember to keep the valves in the head and polish up after your done.
